Marble refacing machine



March 30, y TET ER MARBLE REFACING MACHINE Filed Sept. 30, 1935 3 Shets-Sheet 1 O L T 73 l; OVA/"6Z1 fi tetler INVENTOR ATTO R N EY March 30, 1937.

MARBLE REFACING MACHINE Filed Sept. 50, 1935 5 Sheets-Sheet 2 INVENTOR ATTORNEY L. STETLER v 2,075,369

, L. STETLER MARBLE REFACING MACHINE Maz ch 30, 1937.

Filed Sept. 50, 1935 3'SheetsSheet 3 I .I On 9 m 4 \0 o 7 a |||II l[ II o 9 O M A, 0 3 I I \I 00 w M m A I": m a A, 9 I 9' M 9 7 A, y a M w l\ a j 6 Y O A! G o l 0 6 o 1M m I o 6 .9 w 2 8 3 w n HI w U fllll--- i--.

Patented Mar. 30, 1937 UNITED STATES PATENT OFFICE 3 Claims.

The invention relates to stone resurfacing machines and more especially to a marble resurfacing apparatus.

The primary object of the invention is the provision of a machine or apparatus of this character, wherein through the medium of a rotating element the surface of stone, marble or the like in place within a vertical wall or other structure can be operated upon for the resurfacing thereof and the polishing of the same, the machine or apparatus being readily portable so that it can be set up in confronting relation to the work to be acted upon thereby and the resurfacing element being readily adjustable or shiftable for an extended range of action upon the work and thus the necessity of hand resurfacing is eliminated with resultant dispatch in the handling of the work.

Another object of the invention is the provision of a machine or apparatus of this character,

wherein the resurfacing element is self-adjusting to assure true operation upon the work for the resurfacing thereof and such element is motor driven and is susceptible of adjustment vertically and horizontally within determined limits.

A further object of the invention is the provision of a machine or apparatus'of this character, which is comparatively simple in construction, thoroughly reliable and efficient in its operation, assuring a thorough resurfacing of the work confronted thereby automatic in action and inexpensive to manufacture.

With these and other objects in view, the invention consists in the features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings, which disclose the preferred embodiment of the invention and pointed out in the claims hereunto appended,

In the accompanying drawings:

Figure 1 is a top plan view of a machine or apparatus constructed in accordance with the invention.

Figure 2 is a front elevation thereof.

Figure 3 is an end elevation.

Figure 4 is a fragmentary enlarged elevation partly in section of the movable carriage and adjuncts.

Figure 5 is a top plan view thereof.

Figure 6 is a fragmentary detail elevation of the electric solenoid control for the raising and lowering means for the machine or apparatus.

Figure '7 is a sectional view on the line 1'| of Figure 6.

Figure 8 is a top plan view of the parts shown in Figure '7. 1

Figure 9 is a vertical sectional view through the resurfacing element of the machine or apparatus.

Figure 10 is a fragmentary sectional viewon the line lilli3 of Figure 5.

Figure 11 is a fragmentary detail plan view showing diagrammatically the electric control mechanism of the machine or apparatus.

Figure 12 is an end elevation of a modification for the vertical adjustment of the runners of the machine or apparatus.

Figure 13 is a fragmentary topplan view of a still further modification.

Figure 14 is an end view thereof.

Figure 15 is a sectional View on the line l5l5 of Figure 13.

Figure 16 is a fragmentary sectional view through a further modified form of mounting for the resurfacing element.

Similar reference characters indicate corresponding parts throughout the several views in the drawings.

In Figures 1 to 11 of the drawings there is shown a machine or apparatus wherein the base 5 12 of the stand has equipped therewith spaced front and rear wheels 13 and 14, respectively, the axles for the latter wheels being carried in raising and lowering forks l5swingingly connected with the base while the axles for the wheels 13 are fixed to the base and the purpose of the raising and lowering wheels 14 is to shift the same out of and into traction positions. When the wheels 74 are in traction position the same are held in that position by releasable latching pins it which are mounted in the base 12. When the wheels M are out of traction position the base 12 will be jacked by a rest block or beam 11 superimposed upon a foundation and beneath the base 32 so that the machine or apparatus will be stationarily in confronting relation to work to be operated upon. Now when it is desired to transport the machine or apparatus the wheels 14 are lowered and by the travel of the wheels 13 and 14 upon the foundation the said machine or ap-' paratus can be rolled from one locality to another.

Fixed to and rising from the base 12 is the vertical frame 18, it having at opposite ends the channeled tracks 19 for guide rollers of runners, 8| having forwardly projected horizontally dis posed supporting arms 82 for ashiftable tracking board 83, it having at opposite ends thereof rack gears 84 meshing with racks'85 stationarily fitted with the arms 82 and these gears are 00111111011 55 to a hand crank 86 so that the same can be turned for the shifting of the board 83.

Movable upon the board 83 is a carriage 81, it having traction rollers 88 movable in channeled guide tracks 89 carried at opposite side edges of said board 83. Upon this carriage 81 are the spaced bearings 90 in which is journaled a hollow or tubular rotatable shaft 9| to which is yieldably coupled at 92 the resurfacing element including the disk 93 carrying the sectors 94 of carborundumr or other substance which are selfadjustingjand disposed concentrically upon the disk 93 and are spring tensio'ned at 95, the selfadjusting of the sectors 94 permits the truing of such sectors with relation to the work during the resurfacing thereof in the operation of the machine or apparatus.

Upon the bearings 90 is fitted an electric motor 96 which through the driving gear 91 meshing with a ring gear 98 fixed upon the shaft 9| drives the latter. The shaft 9| has loose thereon the reversing beveled gears 99 and I00; respectively, these meshing with a driven gear I0| common thereto and fixed to a driven shaft I02 suitably journaled upon the carriage 81 and having a worm screw I03 meshing with a worm gear I04 upon a stud shaft I05 having a rack gear I09. This rack gear I00 meshes with a toothed rack I01 fixed longitudinally on the tracking board 83 and coextensive therewith for substantially its length. Splined or keyed to the shaft 9| is a friction clutch I08 which is located between the gears 99 and 100 and is alternately engageable therewith on the shifting of these gears 99 and I00 through the instrumentality of a shift bracket I09 slidably fitting a guide IIO on the carriage 81, the bracket I09 being provided with a clearance III for the shaft I02 which passes therethrough. The guide |I0 carries a spring finger II 2 for engaging the bracket I09 to frictionally hold the same in its shifted position. These gears 99 and I00 reversely drive the carriage 81 on the board 83 and the reversing operation of the gears 99 and I00 will be hereinafter fully described.

At the top of the vertical frame I8 and suitably journaled in bearings II 3 is a winding and unwinding shaft I I4 which is common to windlasses I I5, these being fixed to said shaft and on and from which are wound and unwound raising and lowering cables I I6 which are engaged at I I! with the runners 8'. so that these will operate in unison for the raising and lowering of the arms 82. The shaft I I4 has mounted at one end a hand crank I I8 so that said shaft can be manually turned.

Fixed to the shaft H4 is a ratchet toothed latching disk II9, the teeth I20 being located at opposite sides thereof and are arranged to allow a one-half revolution of the disk when released by coacting latches or dogs f 2| pivoted at I22 in suitable hearings on a cross beam or bar I23 of the frame I8, these dogs or latches I2I being located at opposite sides of the disk 9 to cooperate with theteeth I20 for the latching of said disk against turning movement in one direction while permitting the reverse turning of the disk so that the runners 8| can be elevated for adjustment to any desired height on the frame I8. When the runners 8| are elevated the teeth I20 on the disk I I9 ratchet past the dogs or latches I 2| while on the lowering of the runners it is necessary to alternately release the said dogs or latches I2I from the teeth I20 on the disk II9 asthe dogs or latches are normally in the path 'of' these teeth and will latchthe disk at each half rotation thereof and in this manner on vertical adjustment of the runners III on the frame I8 the said runners can be held in vertically adjusted position.

Connected with the shift bracket I09 are reversely acting solenoids I24 included in independent normally open electric circuits I25 and I26, respectively, which are closed by switches IZ'I, these being located on the carriage 8'! at opposite ends thereof to be disposed in the path of actuating pins I28 selectively engageable at opposite sides of said carriage in holes I29 formed in the board 83 and arranged spaced from each other in a row longitudinally disposed of said board so that when the carriage 8'! is traveling in one direction on the closing of a switch I21 the solenoid I24 in that circuit closed by the said switch will become energized for the shifting of the bracket I99 for the operation of the clutch I08 to reverse the direction of travel of the carriage 81. These pins I28 selectively engaging the holes I29 will control the extent of travel of the carriage 81 on the board 83 and in their cooperation with the switches I21 automatically effect the reversing of the travel of the said carriage upon the board.

Connected with the dogs or latches I2| are reversely acting solenoids I30, these being included in the circuits I25 and I20 and alternately operate simultaneously with the alternate action of 1 the solenoids I24 so that the said dogs or latches |2I will alternately release the latching disk H9 to permit automatic lowering intermittently of the runners BI on the vertical frame I8 and in this fashion change the position of the resurfac- 5.

ing or polishing element including the cutting sectors 94 on the disk 93.

The frame I8 has therein the diagonal braces I3I and is rigidly supported by adjustable props .I32 connected therewith and with the base I2.

with the operation of the bracket I09 for revers-- ing the direction of travel of said carriage.

The resurfacing element of the machine or apparatus can be brought into position with respect to the work when in a fixed position, as for example, when included in the vertical wall of a;

building, so that the marble, stone or the like to 'be resurfaced can be operated upon by the machine or apparatus for that purpose. The working location of the resurfacing element of the machine or apparatus can be altered or changed either'automatically or manually and the cutting blocks or sectors of this element are self-adjusting in conformity with the surface acted upon thereby for resurfacing operation.

In Figure 12 of the drawings there is shown amodification, wherein at the top of the frame of the machine there is arranged at each end at or close to the front of such frame a Windlass I34 to which is connected a. raising and lowering cable I35, it being trained over a guide pulley. I36 which is located near the rear side or intermediate the front and rear of said frame and this cable from the pulley I36 is carried downwardly and attached at I31 to its companion supporting arm 82 for a shiftable tracking board 83."

The Windlass I34 is carried by an operating shaft I38 suitably journaled at I39 at the top of the frame of the machine.

In Figures 13 and 14 of the drawings there is shown a further modification, wherein there is located between spaced parallel boards I40 at the top of the frame of the machine guide pulleys I4I, these being journaled at I42 adjacent to opposite ends of said frame and have trained thereover raising and lowering cables I43 which are attached to and reversely wound and unwound from a Windlass I44 common thereto. The Windlass I44 is journaled at I45 midway of the longitudinal length of the frame of the machine and next to the front thereof. The axle I46 for the windlass I44 is operated by a hand crank I41 at the rear of the machine and this axle carries a ratchet pinion I48 with which cooperates a dog or pawl I49 pivoted at I50 at the top of the frame or machine. The cables I43 are attached to supporting arms I5I for the tracking board hereinbefore referred to. These arms I5I are upon runners 8| hereinbefore described.

In Figure 16 of the drawings there is shown a further modification of a resurfacing element mount, wherein the shaft 25 carries a disk I52 through which play in suitable openings near the periphery of the latter guide stems I53 fixed 3O circularly to a backing plate I54 of a disk-like mount I55 for the resurfacing slabs or blocks (not shown). Interposed between the disk I52 and the plate I54 and centered with relation to the shaft 25 is a-coiled cushioning spring I56 and 3D in this manner the mount I55 is self-adjusting when the slabs or blocks are operating for resurfacing and polishing work. The stems I53 working in the disk I52 maintain these by nuts I51 of the mount I55 with the shaft 25 so that the latter will rotate said mount in the surfacing of the slabs or blocks.

What is claimed is: 1. A machine of the character described comprising a vertical frame having channeled tracks at opposite ends, runners having guide rollers fitting said tracks, forwardly projecting arms on said runners, a shiftable tracking board carried by said arms, a carriage movable on said tracking board, rack and, pinion connection between the board and said carriage, a motor carried by said carriage and operating said pinion, a surfacing element supported by the carriage and driven by said motor, and electrically operated means for reversing the travel of the carriage on the tracking board.

2. A machine of the character described comprising a vertical frame having channeled tracks at opposite ends, runners having guide rollers tting said tracks, forwardly projecting arms on said runners, a shiftable tracking board carried by said arms, a carriage movable on said tracking board, rack and pinion connection between the board and said carriage, a motor carried by said carriage and operating said pinion, a surfacing element supported by the carriage and driven by said motor, electrically operated means for reversing the travel of the carriage on the tracking board, and means for raising and lower-.

ing the runners in unison with each other.

3. A machine of the character described comprising a vertical frame having channeled tracks at opposite ends, runners having guide rollers fitting said tracks, forwardly projecting arms on said runners, a shiftable tracking board carried by said arms, a carriage movable on said tracking board, rack and pinion connection between the board and said carriage, a motor carried by said carriage and operating said pinion, a surfacing element supported by the carriage and driven by said motor, electrically operated means for reversing the travel of the carriage on the tracking board, means for raising and lowering the runners in unison with each other, and means included with the said electric means and the last-named means for automatically effecting the lowering of the runners for changing the position of the surfacing element.

LOWELL STETLER. 

